There have, however, been a few cases of voter fraud from the 2016 election - a lot of them carried out by Republican or Trump voters.

"We're not going to talk about this", was the response from Curtis, who ignored repeated questions about whether the charges undermine his credibility as a political radio host and former state party chairman.

Curtis said she left Steve after just nine months of marriage, "I didn't feel it was an equal partnership, I'll just leave it at that".

That's when she said an election worker told her she had already voted by mail, and the elections office already had her ballot. And Republicans have also long-insisted that the practice of voter fraud is rampant, despite evidence to the contrary.

The case stems from an investigation by the district attorney's office, Hill said, following a probe by the Weld County clerk.

Investigative Reporter Rob Low confronted Curtis as he walked into court asking him, "Did you vote for your ex-wife in the last election Steve?"

Curtis has not entered a plea.

Voter fraud was a contentious issue throughout the presidential election.

Curtis spoke about voter fraud ahead of last year's election.

'Voter fraud is not an easy crime to commit, ' Collins said. At multiple points, the two brought up fraudulent mail-in ballots and "double voting" specifically. "I'm gonna make sure that if I get hit by a bus in the next 30 days that my vote for Donald Trump is already in the system".